Geometric Proof added.
Proofs of and using Line Segments and Angle Properties added.
Proofs of and using Triangle Properties and Congruence added.
Proofs of and using Similar Triangles added
Proofs of and using Quadrilateral Properties added.
Previous proof notes removed.
Proofs of and using Line Segments and Angle Properties added.
Proofs of and using Triangle Properties and Congruence added.
Proofs of and using Similar Triangles added
Proofs of and using Quadrilateral Properties added.
Previous proof notes removed.